Mixxx startup very slow when bluetooth is on

[Owen Williams]

As part of Mixxx's sound device detection, my bluetooth device gets probed, very slowly, on startup. This delays the appearance of the app by 30 seconds or more. Turning off bluetooth eliminates the problem.

I guess we should somehow blacklist bluetooth audio devices? Here's the relevant output I see:

ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5)
ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5)
ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5)
ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5)

[RJ Skerry-Ryan (rryan)]

I spoke w/ the portaudio folks at one point about this and they said that
it's ALSA's fault.

On Tue, May 15, 2012 at 1:42 PM, Owen Williams <email address hidden> wrote:

> Public bug reported:
>
> As part of Mixxx's sound device detection, my bluetooth device gets
> probed, very slowly, on startup. This delays the appearance of the app
> by 30 seconds or more. Turning off bluetooth eliminates the problem.
>
> I guess we should somehow blacklist bluetooth audio devices? Here's the
> relevant output I see:
>
> ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect)
> BT_GET_CAPABILITIES failed : Input/output error(5)
> ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect)
> BT_GET_CAPABILITIES failed : Input/output error(5)
> ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect)
> BT_GET_CAPABILITIES failed : Input/output error(5)
> ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect)
> BT_GET_CAPABILITIES failed : Input/output error(5)
>
> ** Affects: mixxx
> Importance: Undecided
> Status: New
>
> --
> You received this bug notification because you are a member of Mixxx
> Development Team, which is subscribed to Mixxx.
> https://bugs.launchpad.net/bugs/999834
>
> Title:
> Mixxx startup very slow when bluetooth is on
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/mixxx/+bug/999834/+subscriptions
>

[Sean M. Pappalardo (pegasus-renegadetech)]

I'm against blacklisting these. What if you want to use wireless headphones?

[inductiveload (inductiveload)]

This same problem occurs when you instantiate a PyAudio class in Python. Each repitition of "ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5)" takes about 6 seconds, so it is incredibly annoying when I have to wait for 4 of them every time I start the program.

This code is enough to trigger it on my development machine (which has bluetooth).

import pyaudio
p = pyaudio.PyAudio()

On a computer without bluetooth, the errors appear, along with some others, but pass instantly.

Is there any idea of if this is fixable or at least work-aroundable?

[William Good (bkgood)]

Audio device probing is slow in general. We should move it to another thread IMO.

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/6447